Is Writing in Your Family?

The other day, I was jotting a To-Do list in my writer's notebook (I know, lists of household jobs don't really qualify as writing but just bear with me), when I got thinking about my eccentric great-grandfather, who used to keep tiny notebooks full of lists. His lists were more about what he ate or the costs of things during his day. But now, as I consider my own obsession with writing-to-help-me-think, it makes me wonder whether he wasn't a writer that just didn't have the opportunity to write anything more than his lists.

I know I'm related to a magazine editor and an artist/writer, but maybe there are others. There must be  something about the way we think that makes us more inclined to write. Is it hereditary?

Are there any other writers in your family?